Palaeohistology of the holotype of Infernogallus jamesi. Palaeohistological thin sections of the femur (a–d), fibula (e, f) and metatarsal II (g, h) of ROM VP 65050 in plane-polarized light (a,b, e–h) and cross-polarized light (c, d). Blue boxes in (a, c, e, g) show the locations of insets (b, d, f, h). Close-ups (b, d, f, h) show the external cortical region, with lines of arrested growth (arrows) becoming closely packed towards the periosteal surface and increasing organization of bone matrix fibers, indicative of reduced annual growth rates and skeletal maturity.